Jisho

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Wikipedia definition
1. Dead keyA dead key is a special kind of a modifier key on a typewriter or computer keyboard that is typically used to attach a specific diacritic to a base letter. The dead key does not generate a (complete) character by itself but modifies the character generated by the key struck immediately after. Thus, a dedicated key is not needed for each possible combination of a diacritic and a letter, but rather only one dead key for each diacritic is needed, in addition to the normal base letter keys.
Read “Dead key” on English Wikipedia
Read “デッドキー” on Japanese Wikipedia
Read “Dead key” on DBpedia

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